Yokogawa DO402 Dissolved Oxygen Analyzer - Manual (Page 58)

IM 12J05D02-01E
5-22 Parameter setting
Code 44 *D.TIME The delay time (or dead time) sets the minimum relay switching time. This
function can be adjusted to give a good alarm function in a noisy process,
preventing the relay from “chattering” or repeatedly switching when the signal
is close to the setpoint.
*P.HYST The hysteresis is the value beyond the setpoint that the measured value
*T.HYST must exceed before the control function will start working.
Code 45 *RANGE Proportional range is the value above (or below) the setpoint that generates full
output in proportional control.
*PER. The time period of the overall pulse control cycle (one ON and one OFF
period).
*FREQ. The maximum frequency for the pulse frequency control.
Code 46 *tI.CNT The integral time for the PI control settings.
Code 47 *EXPIR When a system is set up to control on the relay outputs, the expiry time can be
enabled to warn of an ineffective control. In other words, when the setpoint is
exceeded for more than 15 minutes an error message is generated. This can
mean, for example, that the reagent tank is empty.